282 Modern Fishculture in Fresh and Salt Water. 



from them, for they appear to be as dry inside as they 

 are outside. If the "whirligigs" eat anything it is when 

 I am not looking, for they are so occupied with their 

 game of tag through a crowd of their fellows that they 



Pupa of Helgramite. 



cannot spare time to feed, and it is hard to tell who 

 is "it." 



The larva of the stone-fly is the caddis, which makes 

 itself a case of leaves, sticks, sand, or other material, 

 and is harmless in all stages; therefore it has no busi- 



Female Helgramite Fly. 



ness to be included in the chapter on enemies of fish; 

 but insects will not get another inning in this book, 

 and the fiishculturist might wonder what the larva 

 might be. Another good fish food that cannot harm a 



